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  • 1995-1999  (7)
  • 1905-1909
  • 1998  (1)
  • 1995  (6)
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  • 1995-1999  (7)
  • 1905-1909
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  • 1
    Electronic Resource
    Electronic Resource
    Classical extended conformal algebras associated with constrained KP hierarchy (1995)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 36 (1995), S. 2959-2971 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: The conformal property of the second Hamiltonian structure of constrained KP hierarchy derived by Oevel and Strampp is examined. It is found that it naturally gives a family of nonlocal extended conformal algebras. Two examples of such algebras are given and it is found that they are similar to Bilal's V algebra. By taking a gauge transformation one can map the constrained KP hierarchy to Kupershmidt's nonstandard Lax hierarchy. The second Hamiltonian structure in this representation is considered. It is shown that after mapping the Lax operator to a pure differential operator the second structure becomes the sum of the second and the third Gelfand–Dickey brackets defined by this differential operator. The corresponding conformally covariant form of this differential operator is also given. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.531004
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  • 2
    Electronic Resource
    Electronic Resource
    Palaeointensity results from the Permo-Carboniferous (Kiaman) reversed superchron: the Great Whin and Midland Valley sills of the northern United Kingdom (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 123 (1995), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Fifty Thellier palaeointensity determinations were made from the Great Whin Sill (GWS) of northern England and the Midland Valley Sill (MVS) of central Scotland, which form the major part of a late Carboniferous quartz-dolerite complex. Palaeodirectional analysis confirms that the reversed polarity characteristic remanence carried by samples from both sills is consistent with the Permo-Carboniferous reversed superchron. Palaeomagnetic results suggest that the two sills may not be exactly contemporaneous. The MVS was intruded rapidly some time during the emplacement of the GWS, which was itself emplaced over a considerable time period. The MVS may well represent the northernmost expression of the instrusive activity. A mean palaeointensity of 22.9 ± 2.6 μT was calculated for the Great Whin Sill, with a corresponding VDM value of 5.9 ± 1022 A m2. The palaeointensity value calculated from the Midland Valley Sill was much lower, 13.0 ± 0.5 μT, with a corresponding VDM value of 3.3 ± 1022 A m2. Detailed rock magnetic analyses and stepwise thermal demagnetization studies reveal that the remanence carrier in both sills is magnetite of mixed domain state. Multidomain grains are less important in the Midland Valley Sill and thus greater confidence is attached to palaeointensity results from this sill. VDM values from this and other studies of the Permo-Carboniferous reversed superchron (P-CRS) indicate that the dipole strength showed similar variations to that witnessed for the past 5 Ma. There is no conclusive support in favour of either the weak or strong field models that have been suggested for superchrons. More palaeointensity results are needed from the termination of the P-CRS and the late Permian/early Triassic in order to understand how the dipole field evolved during the P-CRS and its relationship to the so-called Mesozoic dipole low.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1995.tb06891.x
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  • 3
    Electronic Resource
    Electronic Resource
    Homochiral Methyl (2R,3S)-3-Bromo-2-chloro-3-phenylpropanoate (1995)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 51 (1995), S. 134-135 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270194008218
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  • 4
    Electronic Resource
    Electronic Resource
    Homochiral Methyl (S)-2-Benzoyloxy-4-bromo-4-methylpentanoate (1995)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 51 (1995), S. 2583-2584 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270195008444
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  • 5
    Electronic Resource
    Electronic Resource
    Homochiral Methyl (S)-2-Benzenesulfonyloxy-4-bromo-4-methylpentanoate (1995)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 51 (1995), S. 1411-1412 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270195001818
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  • 6
    Electronic Resource
    Electronic Resource
    Study of the application of viscous plastic processing to hydroxyapatite (1995)
    Springer
    Journal of materials science 14 (1995), S. 1055-1057 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00258163
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  • 7
    Electronic Resource
    Electronic Resource
    The cyanocarbonyl group: synthesis and crystal structure of an imidazole carbonyl cyanide, C12N5OH17 (1998)
    Springer
    Journal of chemical crystallography 28 (1998), S. 561-564 
    Details
    ISSN: 1572-8854
    Keywords: Acylcyanide ; cyanocarbonyl ; imidazole ; carbonyl cyanide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract 1-t-Butyl-5-N-(dimethylaminomethylene)aminoimidazole-4-carbonyl cyanide (BUNDAMIC) is the first acyl cyanide to be synthesized from an imidazole-4-carboxylic acid, diethylphosphorocyanidate, and triethylamine and its structure determined by x-ray crystallography. It crystallizes with four molecules in the monoclinic space group C2/m with a = 17.824(2), b = 6.784(2), c = 11.039(2) Å, and β = 96.17(1)°; R = 0.036 over 1086 unique x-ray reflections. The cyanocarbonyl group is nearly linear, C-C≡ N angle 174.4(3)°, with dimensions C≡ N, 1.137(3); C-C 1.493(3); and C=O≡ N 1.224(3) Å. The imidazole ring, in the mirror plane, has a lengthened C4 = C5 bond of 1.421(3) A, and there is a short ring-closing approach, H⋯ O6 =2.07 Å, between the methyleneamino hydrogen and the carbonyl oxygen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1023200307429
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